In a piece published in Time, Willoughby wrote about how it felt to watch Trump and other members of the White House come to Porter's defense, even after Porter announced he was resigning following multiple reports that he was abusive to his ex-wives, including Willoughby.

"I can’t say I was surprised. But when Donald Trump repeated twice that Rob declared his innocence, I was floored," she wrote.

"What was his intent in emphasizing that point? My friend turned to me and said, 'The President of the United States just called you a liar.' Yes. And so he did," she wrote.

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She also cited Trump's tweet Saturday in which he said lives are being ruined by "a mere allegation" and questioned whether there was "such thing any longer as Due Process?"

"There it is again. The words 'mere allegation' and 'falsely accused' meant to imply that I am a liar. That Colbie Holderness is a liar," she wrote. "That the work Rob was doing in the White House was of higher value than our mental, emotional or physical wellbeing. That his professional contributions are worth more than the truth. That abuse is something to be questioned and doubted."

Willoughby went on to write in Time that the issue is deeper than Trump. Society as a whole, she said, has a "fear of addressing our worst secrets."

"If the most powerful people in the nation do not believe my story of abuse in the face of overwhelming evidence, then what hope do others have of being heard?" she wrote in her op-ed.

She wrote that while she may have compassion for her ex-husband and recognize his need for help, she doesn't tolerate abuse.

"While I may understand President Trump and Gen. Kelly’s incredulity at such a counter-image of their golden boy, I do not condone their choice to support him," she wrote.

"In light of the President’s and the White House’s continued dismissal of me and Colbie, I want to assure you my truth has not been diminished," she continued. "I own my story and now that I have been compelled to share it, I’m not willing to cover it up for anyone."

Trump on Friday praised Porter following his resignation, saying he hopes Porter has a great career ahead of him and that he is going through a tough time.